1 files changed, 114 insertions, 0 deletions
diff --git a/drivers/gpu/drm/msm/msm_iommu.c b/drivers/gpu/drm/msm/msm_iommu.c
new file mode 100644
index 000000000..2a90aa4ca
--- /dev/null
+++ b/drivers/gpu/drm/msm/msm_iommu.c
@@ -0,0 +1,114 @@
+/*
+ * Copyright (C) 2013 Red Hat
+ * Author: Rob Clark <robdclark@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "msm_drv.h"
+#include "msm_mmu.h"
+
+struct msm_iommu {
+	struct msm_mmu base;
+	struct iommu_domain *domain;
+};
+#define to_msm_iommu(x) container_of(x, struct msm_iommu, base)
+
+static int msm_fault_handler(struct iommu_domain *domain, struct device *dev,
+		unsigned long iova, int flags, void *arg)
+{
+	struct msm_iommu *iommu = arg;
+	if (iommu->base.handler)
+		return iommu->base.handler(iommu->base.arg, iova, flags);
+	pr_warn_ratelimited("*** fault: iova=%08lx, flags=%d\n", iova, flags);
+	return 0;
+}
+
+static int msm_iommu_attach(struct msm_mmu *mmu, const char * const *names,
+			    int cnt)
+{
+	struct msm_iommu *iommu = to_msm_iommu(mmu);
+	int ret;
+
+	pm_runtime_get_sync(mmu->dev);
+	ret = iommu_attach_device(iommu->domain, mmu->dev);
+	pm_runtime_put_sync(mmu->dev);
+
+	return ret;
+}
+
+static void msm_iommu_detach(struct msm_mmu *mmu, const char * const *names,
+			     int cnt)
+{
+	struct msm_iommu *iommu = to_msm_iommu(mmu);
+
+	pm_runtime_get_sync(mmu->dev);
+	iommu_detach_device(iommu->domain, mmu->dev);
+	pm_runtime_put_sync(mmu->dev);
+}
+
+static int msm_iommu_map(struct msm_mmu *mmu, uint64_t iova,
+		struct sg_table *sgt, unsigned len, int prot)
+{
+	struct msm_iommu *iommu = to_msm_iommu(mmu);
+	size_t ret;
+
+//	pm_runtime_get_sync(mmu->dev);
+	ret = iommu_map_sg(iommu->domain, iova, sgt->sgl, sgt->nents, prot);
+//	pm_runtime_put_sync(mmu->dev);
+	WARN_ON(!ret);
+
+	return (ret == len) ? 0 : -EINVAL;
+}
+
+static int msm_iommu_unmap(struct msm_mmu *mmu, uint64_t iova,
+		struct sg_table *sgt, unsigned len)
+{
+	struct msm_iommu *iommu = to_msm_iommu(mmu);
+
+	pm_runtime_get_sync(mmu->dev);
+	iommu_unmap(iommu->domain, iova, len);
+	pm_runtime_put_sync(mmu->dev);
+
+	return 0;
+}
+
+static void msm_iommu_destroy(struct msm_mmu *mmu)
+{
+	struct msm_iommu *iommu = to_msm_iommu(mmu);
+	iommu_domain_free(iommu->domain);
+	kfree(iommu);
+}
+
+static const struct msm_mmu_funcs funcs = {
+		.attach = msm_iommu_attach,
+		.detach = msm_iommu_detach,
+		.map = msm_iommu_map,
+		.unmap = msm_iommu_unmap,
+		.destroy = msm_iommu_destroy,
+};
+
+struct msm_mmu *msm_iommu_new(struct device *dev, struct iommu_domain *domain)
+{
+	struct msm_iommu *iommu;
+
+	iommu = kzalloc(sizeof(*iommu), GFP_KERNEL);
+	if (!iommu)
+		return ERR_PTR(-ENOMEM);
+
+	iommu->domain = domain;
+	msm_mmu_init(&iommu->base, dev, &funcs);
+	iommu_set_fault_handler(domain, msm_fault_handler, iommu);
+
+	return &iommu->base;
+}